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Composition and structure of pliocene molluscan associations in the western part of joetsu city niigata prefecture


, : Composition and structure of pliocene molluscan associations in the western part of joetsu city niigata prefecture. Fossils (Tokyo) (51): 1-14

In the western part of Joetsu City, the Pliocene strata are subdivided into the Kawazume, Nadachi and Tanihama formations in upward sequence. The following four molluscan associations occur in the Nadachi Formation; Acila Portlandia (lower sublittoral zone), Nuculana (lower sublittoral to bathyal zone), Delect opecten (bathyal zone) and Calyptogena (bathyal zone) associations. The first association also occurs in the Tanihama Formation and the last is recognized in the Kawazume Formation. These associations include rich protobranch bivalves more than those in shallower waters. The lower sublittoral association shows a higher species diversity than the bathyal one.

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